How did Walter Prescott Webb impact and help contemporary Texas

Webb returned to Europe in 1942 as Harmsworth Professor of American History at Oxford. At the University of Texas he became famous for his books and seminars, especially those on the Great Plains and the Great Frontier, in which he developed two major historical concepts.

Explanation:

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the answer is option a.

union blockade

explanation:

the union blockade in the american civil war was a naval strategy by the united states to prevent the confederacy from trading.

the blockade was proclaimed by president abraham lincoln in april 1861, and required the monitoring of 3,500 miles (5,600 km) of atlantic and gulf coastline, including 12 major ports, notably new orleans and mobile. those blockade runners fast enough to evade the union navy could only carry a small fraction of the supplies needed. they were operated largely by british citizens, making use of neutral ports such as havana, nassau and bermuda. the union commissioned around 500 ships, which destroyed or captured about 1,500 blockade runners over the course of the war.